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NICHOLAS WADE has worked at Nature, Science, and, for many years, the New York Times, where he was an editorial writer, science reporter, and science editor. He has written three books on aspects of recent human evolution.
Did the Covid virus jump naturally from an animal species to humans, or did it escape from a laboratory experiment? In this essay, science writer Nicholas Wade explores the two scenarios and argues that, on present evidence, lab escape is the more likely explanation.